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“By way of comparison, all of us in Baltimore receive a yearly dose from background radiation of over 300 mrem,” he wrote in an email.

General background in the U.S. is about 300 mrem/year, although it varies from place to place from about 150 mrem/year to well over 1,000 mrem/year, based on elevation and rock type.

Because radiation dose increases with altitude, she received an additional 1,740 mrem of high-energy radiation, an astoundingly dangerous dose when viewed through the lens of LNT.

We’ve decided that, in an overall 300 mrem background, reducing this risk by lowering the dose from 50 mrem to something like 10 mrem, is worth, say, spending an additional $100 billion.

Is the risk from 50 mrem worth this?